$3x^2-6xy$
$6x^2-11x-10$
$\frac{\cos^2\left(a\right)}{1-\sin^2\left(a\right)}$
$\lim_{x\to0}\left(\frac{tanx-3x}{x-sin3x}\right)$
$\lim_{x\to2}\left(\frac{\sqrt{x}-2}{x-4}\right)$
$5+x<12$
$0.4\left(x+5\right)=0.4x+2$
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